^ Jake hit the nail on the head.
We just recently moved from a 6.0 to a N20. I personally felt the N20 was a more complete boat. It was designed from the start with a spinnaker, whereas the 6.0 its always been an "add-on."
When racing head to head against the N20's, it always seemed that we were struggling to get the spinnaker tuned just right. We had custom sails cut for it, made adjustments in every little direction, but in the end, its just smart, I think, to go with a system thats been setup by the factory.